When Wang Yuan chose to seal himself into the No. 7 Dormant chamber 200 years ago in order to cure a terminal illness, he was betting on a prosperous future for medicine.
The future arrived as expected, but what greeted him was a world that had long been broken.
Our universe was captured by the "abyss" and began its long process of falling toward its center. During this period, space was extremely unstable, causing the earth and countless other worlds that were also captured to randomly generate "dimensional faults" to form "space passages", triggering "alien invasions." Push human civilization back within the high walls of the last fortress.
One piece of good news and one piece of bad news.
His terminal illness was cured by the unknown energy of the new world; but the world itself was terminally ill.